drivers/gpio/gpio-omap.c

   1 /*
   2  * Support functions for OMAP GPIO
   3  *
   4  * Copyright (C) 2003-2005 Nokia Corporation
   5  * Written by Juha Yrjölä <juha.yrjola@nokia.com>
   6  *
   7  * Copyright (C) 2009 Texas Instruments
   8  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/syscore_ops.h>
  19 #include <linux/err.h>
  20 #include <linux/clk.h>
  21 #include <linux/io.h>
  22 #include <linux/device.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/pm.h>
  25 #include <linux/of.h>
  26 #include <linux/of_device.h>
  27 #include <linux/gpio.h>
  28 #include <linux/bitops.h>
  29 #include <linux/platform_data/gpio-omap.h>
  30
  31 #define OFF_MODE        1
  32
  33 static LIST_HEAD(omap_gpio_list);
  34
  35 struct gpio_regs {
  36         u32 irqenable1;
  37         u32 irqenable2;
  38         u32 wake_en;
  39         u32 ctrl;
  40         u32 oe;
  41         u32 leveldetect0;
  42         u32 leveldetect1;
  43         u32 risingdetect;
  44         u32 fallingdetect;
  45         u32 dataout;
  46         u32 debounce;
  47         u32 debounce_en;
  48 };
  49
  50 struct gpio_bank {
  51         struct list_head node;
  52         void __iomem *base;
  53         u16 irq;
  54         u32 non_wakeup_gpios;
  55         u32 enabled_non_wakeup_gpios;
  56         struct gpio_regs context;
  57         u32 saved_datain;
  58         u32 level_mask;
  59         u32 toggle_mask;
  60         spinlock_t lock;
  61         struct gpio_chip chip;
  62         struct clk *dbck;
  63         u32 mod_usage;
  64         u32 irq_usage;
  65         u32 dbck_enable_mask;
  66         bool dbck_enabled;
  67         struct device *dev;
  68         bool is_mpuio;
  69         bool dbck_flag;
  70         bool loses_context;
  71         bool context_valid;
  72         int stride;
  73         u32 width;
  74         int context_loss_count;
  75         int power_mode;
  76         bool workaround_enabled;
  77
  78         void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable);
  79         int (*get_context_loss_count)(struct device *dev);
  80
  81         struct omap_gpio_reg_offs *regs;
  82 };
  83
  84 #define GPIO_INDEX(bank, gpio) (gpio % bank->width)
  85 #define GPIO_BIT(bank, gpio) (BIT(GPIO_INDEX(bank, gpio)))
  86 #define GPIO_MOD_CTRL_BIT       BIT(0)
  87
  88 #define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
  89 #define LINE_USED(line, offset) (line & (BIT(offset)))
  90
  91 static void omap_gpio_unmask_irq(struct irq_data *d);
  92
  93 static int omap_irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
  94 {
  95         return bank->chip.base + gpio_irq;
  96 }
  97
  98 static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
  99 {
 100         struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
 101         return container_of(chip, struct gpio_bank, chip);
 102 }
 103
 104 static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
 105                                     int is_input)
 106 {
 107         void __iomem *reg = bank->base;
 108         u32 l;
 109
 110         reg += bank->regs->direction;
 111         l = readl_relaxed(reg);
 112         if (is_input)
 113                 l |= BIT(gpio);
 114         else
 115                 l &= ~(BIT(gpio));
 116         writel_relaxed(l, reg);
 117         bank->context.oe = l;
 118 }
 119
 120
 121 /* set data out value using dedicate set/clear register */
 122 static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, int gpio,
 123                                       int enable)
 124 {
 125         void __iomem *reg = bank->base;
 126         u32 l = GPIO_BIT(bank, gpio);
 127
 128         if (enable) {
 129                 reg += bank->regs->set_dataout;
 130                 bank->context.dataout |= l;
 131         } else {
 132                 reg += bank->regs->clr_dataout;
 133                 bank->context.dataout &= ~l;
 134         }
 135
 136         writel_relaxed(l, reg);
 137 }
 138
 139 /* set data out value using mask register */
 140 static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, int gpio,
 141                                        int enable)
 142 {
 143         void __iomem *reg = bank->base + bank->regs->dataout;
 144         u32 gpio_bit = GPIO_BIT(bank, gpio);
 145         u32 l;
 146
 147         l = readl_relaxed(reg);
 148         if (enable)
 149                 l |= gpio_bit;
 150         else
 151                 l &= ~gpio_bit;
 152         writel_relaxed(l, reg);
 153         bank->context.dataout = l;
 154 }
 155
 156 static int omap_get_gpio_datain(struct gpio_bank *bank, int offset)
 157 {
 158         void __iomem *reg = bank->base + bank->regs->datain;
 159
 160         return (readl_relaxed(reg) & (BIT(offset))) != 0;
 161 }
 162
 163 static int omap_get_gpio_dataout(struct gpio_bank *bank, int offset)
 164 {
 165         void __iomem *reg = bank->base + bank->regs->dataout;
 166
 167         return (readl_relaxed(reg) & (BIT(offset))) != 0;
 168 }
 169
 170 static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
 171 {
 172         int l = readl_relaxed(base + reg);
 173
 174         if (set)
 175                 l |= mask;
 176         else
 177                 l &= ~mask;
 178
 179         writel_relaxed(l, base + reg);
 180 }
 181
 182 static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
 183 {
 184         if (bank->dbck_enable_mask && !bank->dbck_enabled) {
 185                 clk_prepare_enable(bank->dbck);
 186                 bank->dbck_enabled = true;
 187
 188                 writel_relaxed(bank->dbck_enable_mask,
 189                              bank->base + bank->regs->debounce_en);
 190         }
 191 }
 192
 193 static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
 194 {
 195         if (bank->dbck_enable_mask && bank->dbck_enabled) {
 196                 /*
 197                  * Disable debounce before cutting it's clock. If debounce is
 198                  * enabled but the clock is not, GPIO module seems to be unable
 199                  * to detect events and generate interrupts at least on OMAP3.
 200                  */
 201                 writel_relaxed(0, bank->base + bank->regs->debounce_en);
 202
 203                 clk_disable_unprepare(bank->dbck);
 204                 bank->dbck_enabled = false;
 205         }
 206 }
 207
 208 /**
 209  * omap2_set_gpio_debounce - low level gpio debounce time
 210  * @bank: the gpio bank we're acting upon
 211  * @gpio: the gpio number on this @gpio
 212  * @debounce: debounce time to use
 213  *
 214  * OMAP's debounce time is in 31us steps so we need
 215  * to convert and round up to the closest unit.
 216  */
 217 static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
 218                                     unsigned debounce)
 219 {
 220         void __iomem            *reg;
 221         u32                     val;
 222         u32                     l;
 223
 224         if (!bank->dbck_flag)
 225                 return;
 226
 227         if (debounce < 32)
 228                 debounce = 0x01;
 229         else if (debounce > 7936)
 230                 debounce = 0xff;
 231         else
 232                 debounce = (debounce / 0x1f) - 1;
 233
 234         l = GPIO_BIT(bank, gpio);
 235
 236         clk_prepare_enable(bank->dbck);
 237         reg = bank->base + bank->regs->debounce;
 238         writel_relaxed(debounce, reg);
 239
 240         reg = bank->base + bank->regs->debounce_en;
 241         val = readl_relaxed(reg);
 242
 243         if (debounce)
 244                 val |= l;
 245         else
 246                 val &= ~l;
 247         bank->dbck_enable_mask = val;
 248
 249         writel_relaxed(val, reg);
 250         clk_disable_unprepare(bank->dbck);
 251         /*
 252          * Enable debounce clock per module.
 253          * This call is mandatory because in omap_gpio_request() when
 254          * *_runtime_get_sync() is called,  _gpio_dbck_enable() within
 255          * runtime callbck fails to turn on dbck because dbck_enable_mask
 256          * used within _gpio_dbck_enable() is still not initialized at
 257          * that point. Therefore we have to enable dbck here.
 258          */
 259         omap_gpio_dbck_enable(bank);
 260         if (bank->dbck_enable_mask) {
 261                 bank->context.debounce = debounce;
 262                 bank->context.debounce_en = val;
 263         }
 264 }
 265
 266 /**
 267  * omap_clear_gpio_debounce - clear debounce settings for a gpio
 268  * @bank: the gpio bank we're acting upon
 269  * @gpio: the gpio number on this @gpio
 270  *
 271  * If a gpio is using debounce, then clear the debounce enable bit and if
 272  * this is the only gpio in this bank using debounce, then clear the debounce
 273  * time too. The debounce clock will also be disabled when calling this function
 274  * if this is the only gpio in the bank using debounce.
 275  */
 276 static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned gpio)
 277 {
 278         u32 gpio_bit = GPIO_BIT(bank, gpio);
 279
 280         if (!bank->dbck_flag)
 281                 return;
 282
 283         if (!(bank->dbck_enable_mask & gpio_bit))
 284                 return;
 285
 286         bank->dbck_enable_mask &= ~gpio_bit;
 287         bank->context.debounce_en &= ~gpio_bit;
 288         writel_relaxed(bank->context.debounce_en,
 289                      bank->base + bank->regs->debounce_en);
 290
 291         if (!bank->dbck_enable_mask) {
 292                 bank->context.debounce = 0;
 293                 writel_relaxed(bank->context.debounce, bank->base +
 294                              bank->regs->debounce);
 295                 clk_disable_unprepare(bank->dbck);
 296                 bank->dbck_enabled = false;
 297         }
 298 }
 299
 300 static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
 301                                                 unsigned trigger)
 302 {
 303         void __iomem *base = bank->base;
 304         u32 gpio_bit = BIT(gpio);
 305
 306         omap_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
 307                       trigger & IRQ_TYPE_LEVEL_LOW);
 308         omap_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
 309                       trigger & IRQ_TYPE_LEVEL_HIGH);
 310         omap_gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
 311                       trigger & IRQ_TYPE_EDGE_RISING);
 312         omap_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
 313                       trigger & IRQ_TYPE_EDGE_FALLING);
 314
 315         bank->context.leveldetect0 =
 316                         readl_relaxed(bank->base + bank->regs->leveldetect0);
 317         bank->context.leveldetect1 =
 318                         readl_relaxed(bank->base + bank->regs->leveldetect1);
 319         bank->context.risingdetect =
 320                         readl_relaxed(bank->base + bank->regs->risingdetect);
 321         bank->context.fallingdetect =
 322                         readl_relaxed(bank->base + bank->regs->fallingdetect);
 323
 324         if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
 325                 omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
 326                 bank->context.wake_en =
 327                         readl_relaxed(bank->base + bank->regs->wkup_en);
 328         }
 329
 330         /* This part needs to be executed always for OMAP{34xx, 44xx} */
 331         if (!bank->regs->irqctrl) {
 332                 /* On omap24xx proceed only when valid GPIO bit is set */
 333                 if (bank->non_wakeup_gpios) {
 334                         if (!(bank->non_wakeup_gpios & gpio_bit))
 335                                 goto exit;
 336                 }
 337
 338                 /*
 339                  * Log the edge gpio and manually trigger the IRQ
 340                  * after resume if the input level changes
 341                  * to avoid irq lost during PER RET/OFF mode
 342                  * Applies for omap2 non-wakeup gpio and all omap3 gpios
 343                  */
 344                 if (trigger & IRQ_TYPE_EDGE_BOTH)
 345                         bank->enabled_non_wakeup_gpios |= gpio_bit;
 346                 else
 347                         bank->enabled_non_wakeup_gpios &= ~gpio_bit;
 348         }
 349
 350 exit:
 351         bank->level_mask =
 352                 readl_relaxed(bank->base + bank->regs->leveldetect0) |
 353                 readl_relaxed(bank->base + bank->regs->leveldetect1);
 354 }
 355
 356 #ifdef CONFIG_ARCH_OMAP1
 357 /*
 358  * This only applies to chips that can't do both rising and falling edge
 359  * detection at once.  For all other chips, this function is a noop.
 360  */
 361 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
 362 {
 363         void __iomem *reg = bank->base;
 364         u32 l = 0;
 365
 366         if (!bank->regs->irqctrl)
 367                 return;
 368
 369         reg += bank->regs->irqctrl;
 370
 371         l = readl_relaxed(reg);
 372         if ((l >> gpio) & 1)
 373                 l &= ~(BIT(gpio));
 374         else
 375                 l |= BIT(gpio);
 376
 377         writel_relaxed(l, reg);
 378 }
 379 #else
 380 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
 381 #endif
 382
 383 static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
 384                                     unsigned trigger)
 385 {
 386         void __iomem *reg = bank->base;
 387         void __iomem *base = bank->base;
 388         u32 l = 0;
 389
 390         if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
 391                 omap_set_gpio_trigger(bank, gpio, trigger);
 392         } else if (bank->regs->irqctrl) {
 393                 reg += bank->regs->irqctrl;
 394
 395                 l = readl_relaxed(reg);
 396                 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
 397                         bank->toggle_mask |= BIT(gpio);
 398                 if (trigger & IRQ_TYPE_EDGE_RISING)
 399                         l |= BIT(gpio);
 400                 else if (trigger & IRQ_TYPE_EDGE_FALLING)
 401                         l &= ~(BIT(gpio));
 402                 else
 403                         return -EINVAL;
 404
 405                 writel_relaxed(l, reg);
 406         } else if (bank->regs->edgectrl1) {
 407                 if (gpio & 0x08)
 408                         reg += bank->regs->edgectrl2;
 409                 else
 410                         reg += bank->regs->edgectrl1;
 411
 412                 gpio &= 0x07;
 413                 l = readl_relaxed(reg);
 414                 l &= ~(3 << (gpio << 1));
 415                 if (trigger & IRQ_TYPE_EDGE_RISING)
 416                         l |= 2 << (gpio << 1);
 417                 if (trigger & IRQ_TYPE_EDGE_FALLING)
 418                         l |= BIT(gpio << 1);
 419
 420                 /* Enable wake-up during idle for dynamic tick */
 421                 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger);
 422                 bank->context.wake_en =
 423                         readl_relaxed(bank->base + bank->regs->wkup_en);
 424                 writel_relaxed(l, reg);
 425         }
 426         return 0;
 427 }
 428
 429 static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
 430 {
 431         if (bank->regs->pinctrl) {
 432                 void __iomem *reg = bank->base + bank->regs->pinctrl;
 433
 434                 /* Claim the pin for MPU */
 435                 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
 436         }
 437
 438         if (bank->regs->ctrl && !BANK_USED(bank)) {
 439                 void __iomem *reg = bank->base + bank->regs->ctrl;
 440                 u32 ctrl;
 441
 442                 ctrl = readl_relaxed(reg);
 443                 /* Module is enabled, clocks are not gated */
 444                 ctrl &= ~GPIO_MOD_CTRL_BIT;
 445                 writel_relaxed(ctrl, reg);
 446                 bank->context.ctrl = ctrl;
 447         }
 448 }
 449
 450 static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
 451 {
 452         void __iomem *base = bank->base;
 453
 454         if (bank->regs->wkup_en &&
 455             !LINE_USED(bank->mod_usage, offset) &&
 456             !LINE_USED(bank->irq_usage, offset)) {
 457                 /* Disable wake-up during idle for dynamic tick */
 458                 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0);
 459                 bank->context.wake_en =
 460                         readl_relaxed(bank->base + bank->regs->wkup_en);
 461         }
 462
 463         if (bank->regs->ctrl && !BANK_USED(bank)) {
 464                 void __iomem *reg = bank->base + bank->regs->ctrl;
 465                 u32 ctrl;
 466
 467                 ctrl = readl_relaxed(reg);
 468                 /* Module is disabled, clocks are gated */
 469                 ctrl |= GPIO_MOD_CTRL_BIT;
 470                 writel_relaxed(ctrl, reg);
 471                 bank->context.ctrl = ctrl;
 472         }
 473 }
 474
 475 static int omap_gpio_is_input(struct gpio_bank *bank, int mask)
 476 {
 477         void __iomem *reg = bank->base + bank->regs->direction;
 478
 479         return readl_relaxed(reg) & mask;
 480 }
 481
 482 static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned gpio,
 483                                unsigned offset)
 484 {
 485         if (!LINE_USED(bank->mod_usage, offset)) {
 486                 omap_enable_gpio_module(bank, offset);
 487                 omap_set_gpio_direction(bank, offset, 1);
 488         }
 489         bank->irq_usage |= BIT(GPIO_INDEX(bank, gpio));
 490 }
 491
 492 static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
 493 {
 494         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 495         unsigned gpio = 0;
 496         int retval;
 497         unsigned long flags;
 498         unsigned offset;
 499
 500         if (!BANK_USED(bank))
 501                 pm_runtime_get_sync(bank->dev);
 502
 503 #ifdef CONFIG_ARCH_OMAP1
 504         if (d->irq > IH_MPUIO_BASE)
 505                 gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE);
 506 #endif
 507
 508         if (!gpio)
 509                 gpio = omap_irq_to_gpio(bank, d->hwirq);
 510
 511         if (type & ~IRQ_TYPE_SENSE_MASK)
 512                 return -EINVAL;
 513
 514         if (!bank->regs->leveldetect0 &&
 515                 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
 516                 return -EINVAL;
 517
 518         spin_lock_irqsave(&bank->lock, flags);
 519         offset = GPIO_INDEX(bank, gpio);
 520         retval = omap_set_gpio_triggering(bank, offset, type);
 521         omap_gpio_init_irq(bank, gpio, offset);
 522         if (!omap_gpio_is_input(bank, BIT(offset))) {
 523                 spin_unlock_irqrestore(&bank->lock, flags);
 524                 return -EINVAL;
 525         }
 526         spin_unlock_irqrestore(&bank->lock, flags);
 527
 528         if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
 529                 __irq_set_handler_locked(d->irq, handle_level_irq);
 530         else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
 531                 __irq_set_handler_locked(d->irq, handle_edge_irq);
 532
 533         return retval;
 534 }
 535
 536 static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 537 {
 538         void __iomem *reg = bank->base;
 539
 540         reg += bank->regs->irqstatus;
 541         writel_relaxed(gpio_mask, reg);
 542
 543         /* Workaround for clearing DSP GPIO interrupts to allow retention */
 544         if (bank->regs->irqstatus2) {
 545                 reg = bank->base + bank->regs->irqstatus2;
 546                 writel_relaxed(gpio_mask, reg);
 547         }
 548
 549         /* Flush posted write for the irq status to avoid spurious interrupts */
 550         readl_relaxed(reg);
 551 }
 552
 553 static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
 554 {
 555         omap_clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
 556 }
 557
 558 static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
 559 {
 560         void __iomem *reg = bank->base;
 561         u32 l;
 562         u32 mask = (BIT(bank->width)) - 1;
 563
 564         reg += bank->regs->irqenable;
 565         l = readl_relaxed(reg);
 566         if (bank->regs->irqenable_inv)
 567                 l = ~l;
 568         l &= mask;
 569         return l;
 570 }
 571
 572 static void omap_enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 573 {
 574         void __iomem *reg = bank->base;
 575         u32 l;
 576
 577         if (bank->regs->set_irqenable) {
 578                 reg += bank->regs->set_irqenable;
 579                 l = gpio_mask;
 580                 bank->context.irqenable1 |= gpio_mask;
 581         } else {
 582                 reg += bank->regs->irqenable;
 583                 l = readl_relaxed(reg);
 584                 if (bank->regs->irqenable_inv)
 585                         l &= ~gpio_mask;
 586                 else
 587                         l |= gpio_mask;
 588                 bank->context.irqenable1 = l;
 589         }
 590
 591         writel_relaxed(l, reg);
 592 }
 593
 594 static void omap_disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 595 {
 596         void __iomem *reg = bank->base;
 597         u32 l;
 598
 599         if (bank->regs->clr_irqenable) {
 600                 reg += bank->regs->clr_irqenable;
 601                 l = gpio_mask;
 602                 bank->context.irqenable1 &= ~gpio_mask;
 603         } else {
 604                 reg += bank->regs->irqenable;
 605                 l = readl_relaxed(reg);
 606                 if (bank->regs->irqenable_inv)
 607                         l |= gpio_mask;
 608                 else
 609                         l &= ~gpio_mask;
 610                 bank->context.irqenable1 = l;
 611         }
 612
 613         writel_relaxed(l, reg);
 614 }
 615
 616 static inline void omap_set_gpio_irqenable(struct gpio_bank *bank, int gpio,
 617                                            int enable)
 618 {
 619         if (enable)
 620                 omap_enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
 621         else
 622                 omap_disable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
 623 }
 624
 625 /*
 626  * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
 627  * 1510 does not seem to have a wake-up register. If JTAG is connected
 628  * to the target, system will wake up always on GPIO events. While
 629  * system is running all registered GPIO interrupts need to have wake-up
 630  * enabled. When system is suspended, only selected GPIO interrupts need
 631  * to have wake-up enabled.
 632  */
 633 static int omap_set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
 634 {
 635         u32 gpio_bit = GPIO_BIT(bank, gpio);
 636         unsigned long flags;
 637
 638         if (bank->non_wakeup_gpios & gpio_bit) {
 639                 dev_err(bank->dev,
 640                         "Unable to modify wakeup on non-wakeup GPIO%d\n", gpio);
 641                 return -EINVAL;
 642         }
 643
 644         spin_lock_irqsave(&bank->lock, flags);
 645         if (enable)
 646                 bank->context.wake_en |= gpio_bit;
 647         else
 648                 bank->context.wake_en &= ~gpio_bit;
 649
 650         writel_relaxed(bank->context.wake_en, bank->base + bank->regs->wkup_en);
 651         spin_unlock_irqrestore(&bank->lock, flags);
 652
 653         return 0;
 654 }
 655
 656 static void omap_reset_gpio(struct gpio_bank *bank, int gpio)
 657 {
 658         omap_set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
 659         omap_set_gpio_irqenable(bank, gpio, 0);
 660         omap_clear_gpio_irqstatus(bank, gpio);
 661         omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
 662         omap_clear_gpio_debounce(bank, gpio);
 663 }
 664
 665 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
 666 static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
 667 {
 668         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 669         unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
 670
 671         return omap_set_gpio_wakeup(bank, gpio, enable);
 672 }
 673
 674 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
 675 {
 676         struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
 677         unsigned long flags;
 678
 679         /*
 680          * If this is the first gpio_request for the bank,
 681          * enable the bank module.
 682          */
 683         if (!BANK_USED(bank))
 684                 pm_runtime_get_sync(bank->dev);
 685
 686         spin_lock_irqsave(&bank->lock, flags);
 687         /* Set trigger to none. You need to enable the desired trigger with
 688          * request_irq() or set_irq_type(). Only do this if the IRQ line has
 689          * not already been requested.
 690          */
 691         if (!LINE_USED(bank->irq_usage, offset)) {
 692                 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
 693                 omap_enable_gpio_module(bank, offset);
 694         }
 695         bank->mod_usage |= BIT(offset);
 696         spin_unlock_irqrestore(&bank->lock, flags);
 697
 698         return 0;
 699 }
 700
 701 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
 702 {
 703         struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
 704         unsigned long flags;
 705
 706         spin_lock_irqsave(&bank->lock, flags);
 707         bank->mod_usage &= ~(BIT(offset));
 708         omap_disable_gpio_module(bank, offset);
 709         omap_reset_gpio(bank, bank->chip.base + offset);
 710         spin_unlock_irqrestore(&bank->lock, flags);
 711
 712         /*
 713          * If this is the last gpio to be freed in the bank,
 714          * disable the bank module.
 715          */
 716         if (!BANK_USED(bank))
 717                 pm_runtime_put(bank->dev);
 718 }
 719
 720 /*
 721  * We need to unmask the GPIO bank interrupt as soon as possible to
 722  * avoid missing GPIO interrupts for other lines in the bank.
 723  * Then we need to mask-read-clear-unmask the triggered GPIO lines
 724  * in the bank to avoid missing nested interrupts for a GPIO line.
 725  * If we wait to unmask individual GPIO lines in the bank after the
 726  * line's interrupt handler has been run, we may miss some nested
 727  * interrupts.
 728  */
 729 static void omap_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
 730 {
 731         void __iomem *isr_reg = NULL;
 732         u32 isr;
 733         unsigned int bit;
 734         struct gpio_bank *bank;
 735         int unmasked = 0;
 736         struct irq_chip *irqchip = irq_desc_get_chip(desc);
 737         struct gpio_chip *chip = irq_get_handler_data(irq);
 738
 739         chained_irq_enter(irqchip, desc);
 740
 741         bank = container_of(chip, struct gpio_bank, chip);
 742         isr_reg = bank->base + bank->regs->irqstatus;
 743         pm_runtime_get_sync(bank->dev);
 744
 745         if (WARN_ON(!isr_reg))
 746                 goto exit;
 747
 748         while (1) {
 749                 u32 isr_saved, level_mask = 0;
 750                 u32 enabled;
 751
 752                 enabled = omap_get_gpio_irqbank_mask(bank);
 753                 isr_saved = isr = readl_relaxed(isr_reg) & enabled;
 754
 755                 if (bank->level_mask)
 756                         level_mask = bank->level_mask & enabled;
 757
 758                 /* clear edge sensitive interrupts before handler(s) are
 759                 called so that we don't miss any interrupt occurred while
 760                 executing them */
 761                 omap_disable_gpio_irqbank(bank, isr_saved & ~level_mask);
 762                 omap_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
 763                 omap_enable_gpio_irqbank(bank, isr_saved & ~level_mask);
 764
 765                 /* if there is only edge sensitive GPIO pin interrupts
 766                 configured, we could unmask GPIO bank interrupt immediately */
 767                 if (!level_mask && !unmasked) {
 768                         unmasked = 1;
 769                         chained_irq_exit(irqchip, desc);
 770                 }
 771
 772                 if (!isr)
 773                         break;
 774
 775                 while (isr) {
 776                         bit = __ffs(isr);
 777                         isr &= ~(BIT(bit));
 778
 779                         /*
 780                          * Some chips can't respond to both rising and falling
 781                          * at the same time.  If this irq was requested with
 782                          * both flags, we need to flip the ICR data for the IRQ
 783                          * to respond to the IRQ for the opposite direction.
 784                          * This will be indicated in the bank toggle_mask.
 785                          */
 786                         if (bank->toggle_mask & (BIT(bit)))
 787                                 omap_toggle_gpio_edge_triggering(bank, bit);
 788
 789                         generic_handle_irq(irq_find_mapping(bank->chip.irqdomain,
 790                                                             bit));
 791                 }
 792         }
 793         /* if bank has any level sensitive GPIO pin interrupt
 794         configured, we must unmask the bank interrupt only after
 795         handler(s) are executed in order to avoid spurious bank
 796         interrupt */
 797 exit:
 798         if (!unmasked)
 799                 chained_irq_exit(irqchip, desc);
 800         pm_runtime_put(bank->dev);
 801 }
 802
 803 static unsigned int omap_gpio_irq_startup(struct irq_data *d)
 804 {
 805         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 806         unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
 807         unsigned long flags;
 808         unsigned offset = GPIO_INDEX(bank, gpio);
 809
 810         if (!BANK_USED(bank))
 811                 pm_runtime_get_sync(bank->dev);
 812
 813         spin_lock_irqsave(&bank->lock, flags);
 814         omap_gpio_init_irq(bank, gpio, offset);
 815         spin_unlock_irqrestore(&bank->lock, flags);
 816         omap_gpio_unmask_irq(d);
 817
 818         return 0;
 819 }
 820
 821 static void omap_gpio_irq_shutdown(struct irq_data *d)
 822 {
 823         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 824         unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
 825         unsigned long flags;
 826         unsigned offset = GPIO_INDEX(bank, gpio);
 827
 828         spin_lock_irqsave(&bank->lock, flags);
 829         bank->irq_usage &= ~(BIT(offset));
 830         omap_disable_gpio_module(bank, offset);
 831         omap_reset_gpio(bank, gpio);
 832         spin_unlock_irqrestore(&bank->lock, flags);
 833
 834         /*
 835          * If this is the last IRQ to be freed in the bank,
 836          * disable the bank module.
 837          */
 838         if (!BANK_USED(bank))
 839                 pm_runtime_put(bank->dev);
 840 }
 841
 842 static void omap_gpio_ack_irq(struct irq_data *d)
 843 {
 844         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 845         unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
 846
 847         omap_clear_gpio_irqstatus(bank, gpio);
 848 }
 849
 850 static void omap_gpio_mask_irq(struct irq_data *d)
 851 {
 852         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 853         unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
 854         unsigned long flags;
 855
 856         spin_lock_irqsave(&bank->lock, flags);
 857         omap_set_gpio_irqenable(bank, gpio, 0);
 858         omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
 859         spin_unlock_irqrestore(&bank->lock, flags);
 860 }
 861
 862 static void omap_gpio_unmask_irq(struct irq_data *d)
 863 {
 864         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 865         unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
 866         unsigned int irq_mask = GPIO_BIT(bank, gpio);
 867         u32 trigger = irqd_get_trigger_type(d);
 868         unsigned long flags;
 869
 870         spin_lock_irqsave(&bank->lock, flags);
 871         if (trigger)
 872                 omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
 873
 874         /* For level-triggered GPIOs, the clearing must be done after
 875          * the HW source is cleared, thus after the handler has run */
 876         if (bank->level_mask & irq_mask) {
 877                 omap_set_gpio_irqenable(bank, gpio, 0);
 878                 omap_clear_gpio_irqstatus(bank, gpio);
 879         }
 880
 881         omap_set_gpio_irqenable(bank, gpio, 1);
 882         spin_unlock_irqrestore(&bank->lock, flags);
 883 }
 884
 885 /*---------------------------------------------------------------------*/
 886
 887 static int omap_mpuio_suspend_noirq(struct device *dev)
 888 {
 889         struct platform_device *pdev = to_platform_device(dev);
 890         struct gpio_bank        *bank = platform_get_drvdata(pdev);
 891         void __iomem            *mask_reg = bank->base +
 892                                         OMAP_MPUIO_GPIO_MASKIT / bank->stride;
 893         unsigned long           flags;
 894
 895         spin_lock_irqsave(&bank->lock, flags);
 896         writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
 897         spin_unlock_irqrestore(&bank->lock, flags);
 898
 899         return 0;
 900 }
 901
 902 static int omap_mpuio_resume_noirq(struct device *dev)
 903 {
 904         struct platform_device *pdev = to_platform_device(dev);
 905         struct gpio_bank        *bank = platform_get_drvdata(pdev);
 906         void __iomem            *mask_reg = bank->base +
 907                                         OMAP_MPUIO_GPIO_MASKIT / bank->stride;
 908         unsigned long           flags;
 909
 910         spin_lock_irqsave(&bank->lock, flags);
 911         writel_relaxed(bank->context.wake_en, mask_reg);
 912         spin_unlock_irqrestore(&bank->lock, flags);
 913
 914         return 0;
 915 }
 916
 917 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
 918         .suspend_noirq = omap_mpuio_suspend_noirq,
 919         .resume_noirq = omap_mpuio_resume_noirq,
 920 };
 921
 922 /* use platform_driver for this. */
 923 static struct platform_driver omap_mpuio_driver = {
 924         .driver         = {
 925                 .name   = "mpuio",
 926                 .pm     = &omap_mpuio_dev_pm_ops,
 927         },
 928 };
 929
 930 static struct platform_device omap_mpuio_device = {
 931         .name           = "mpuio",
 932         .id             = -1,
 933         .dev = {
 934                 .driver = &omap_mpuio_driver.driver,
 935         }
 936         /* could list the /proc/iomem resources */
 937 };
 938
 939 static inline void omap_mpuio_init(struct gpio_bank *bank)
 940 {
 941         platform_set_drvdata(&omap_mpuio_device, bank);
 942
 943         if (platform_driver_register(&omap_mpuio_driver) == 0)
 944                 (void) platform_device_register(&omap_mpuio_device);
 945 }
 946
 947 /*---------------------------------------------------------------------*/
 948
 949 static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 950 {
 951         struct gpio_bank *bank;
 952         unsigned long flags;
 953         void __iomem *reg;
 954         int dir;
 955
 956         bank = container_of(chip, struct gpio_bank, chip);
 957         reg = bank->base + bank->regs->direction;
 958         spin_lock_irqsave(&bank->lock, flags);
 959         dir = !!(readl_relaxed(reg) & BIT(offset));
 960         spin_unlock_irqrestore(&bank->lock, flags);
 961         return dir;
 962 }
 963
 964 static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
 965 {
 966         struct gpio_bank *bank;
 967         unsigned long flags;
 968
 969         bank = container_of(chip, struct gpio_bank, chip);
 970         spin_lock_irqsave(&bank->lock, flags);
 971         omap_set_gpio_direction(bank, offset, 1);
 972         spin_unlock_irqrestore(&bank->lock, flags);
 973         return 0;
 974 }
 975
 976 static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
 977 {
 978         struct gpio_bank *bank;
 979         u32 mask;
 980
 981         bank = container_of(chip, struct gpio_bank, chip);
 982         mask = (BIT(offset));
 983
 984         if (omap_gpio_is_input(bank, mask))
 985                 return omap_get_gpio_datain(bank, offset);
 986         else
 987                 return omap_get_gpio_dataout(bank, offset);
 988 }
 989
 990 static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
 991 {
 992         struct gpio_bank *bank;
 993         unsigned long flags;
 994
 995         bank = container_of(chip, struct gpio_bank, chip);
 996         spin_lock_irqsave(&bank->lock, flags);
 997         bank->set_dataout(bank, offset, value);
 998         omap_set_gpio_direction(bank, offset, 0);
 999         spin_unlock_irqrestore(&bank->lock, flags);
1000         return 0;
1001 }
1002
1003 static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
1004                               unsigned debounce)
1005 {
1006         struct gpio_bank *bank;
1007         unsigned long flags;
1008
1009         bank = container_of(chip, struct gpio_bank, chip);
1010
1011         spin_lock_irqsave(&bank->lock, flags);
1012         omap2_set_gpio_debounce(bank, offset, debounce);
1013         spin_unlock_irqrestore(&bank->lock, flags);
1014
1015         return 0;
1016 }
1017
1018 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
1019 {
1020         struct gpio_bank *bank;
1021         unsigned long flags;
1022
1023         bank = container_of(chip, struct gpio_bank, chip);
1024         spin_lock_irqsave(&bank->lock, flags);
1025         bank->set_dataout(bank, offset, value);
1026         spin_unlock_irqrestore(&bank->lock, flags);
1027 }
1028
1029 /*---------------------------------------------------------------------*/
1030
1031 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
1032 {
1033         static bool called;
1034         u32 rev;
1035
1036         if (called || bank->regs->revision == USHRT_MAX)
1037                 return;
1038
1039         rev = readw_relaxed(bank->base + bank->regs->revision);
1040         pr_info("OMAP GPIO hardware version %d.%d\n",
1041                 (rev >> 4) & 0x0f, rev & 0x0f);
1042
1043         called = true;
1044 }
1045
1046 static void omap_gpio_mod_init(struct gpio_bank *bank)
1047 {
1048         void __iomem *base = bank->base;
1049         u32 l = 0xffffffff;
1050
1051         if (bank->width == 16)
1052                 l = 0xffff;
1053
1054         if (bank->is_mpuio) {
1055                 writel_relaxed(l, bank->base + bank->regs->irqenable);
1056                 return;
1057         }
1058
1059         omap_gpio_rmw(base, bank->regs->irqenable, l,
1060                       bank->regs->irqenable_inv);
1061         omap_gpio_rmw(base, bank->regs->irqstatus, l,
1062                       !bank->regs->irqenable_inv);
1063         if (bank->regs->debounce_en)
1064                 writel_relaxed(0, base + bank->regs->debounce_en);
1065
1066         /* Save OE default value (0xffffffff) in the context */
1067         bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1068          /* Initialize interface clk ungated, module enabled */
1069         if (bank->regs->ctrl)
1070                 writel_relaxed(0, base + bank->regs->ctrl);
1071
1072         bank->dbck = clk_get(bank->dev, "dbclk");
1073         if (IS_ERR(bank->dbck))
1074                 dev_err(bank->dev, "Could not get gpio dbck\n");
1075 }
1076
1077 static void
1078 omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
1079                     unsigned int num)
1080 {
1081         struct irq_chip_generic *gc;
1082         struct irq_chip_type *ct;
1083
1084         gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base,
1085                                     handle_simple_irq);
1086         if (!gc) {
1087                 dev_err(bank->dev, "Memory alloc failed for gc\n");
1088                 return;
1089         }
1090
1091         ct = gc->chip_types;
1092
1093         /* NOTE: No ack required, reading IRQ status clears it. */
1094         ct->chip.irq_mask = irq_gc_mask_set_bit;
1095         ct->chip.irq_unmask = irq_gc_mask_clr_bit;
1096         ct->chip.irq_set_type = omap_gpio_irq_type;
1097
1098         if (bank->regs->wkup_en)
1099                 ct->chip.irq_set_wake = omap_gpio_wake_enable;
1100
1101         ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
1102         irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
1103                                IRQ_NOREQUEST | IRQ_NOPROBE, 0);
1104 }
1105
1106 static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
1107 {
1108         int j;
1109         static int gpio;
1110         int irq_base = 0;
1111         int ret;
1112
1113         /*
1114          * REVISIT eventually switch from OMAP-specific gpio structs
1115          * over to the generic ones
1116          */
1117         bank->chip.request = omap_gpio_request;
1118         bank->chip.free = omap_gpio_free;
1119         bank->chip.get_direction = omap_gpio_get_direction;
1120         bank->chip.direction_input = omap_gpio_input;
1121         bank->chip.get = omap_gpio_get;
1122         bank->chip.direction_output = omap_gpio_output;
1123         bank->chip.set_debounce = omap_gpio_debounce;
1124         bank->chip.set = omap_gpio_set;
1125         if (bank->is_mpuio) {
1126                 bank->chip.label = "mpuio";
1127                 if (bank->regs->wkup_en)
1128                         bank->chip.dev = &omap_mpuio_device.dev;
1129                 bank->chip.base = OMAP_MPUIO(0);
1130         } else {
1131                 bank->chip.label = "gpio";
1132                 bank->chip.base = gpio;
1133                 gpio += bank->width;
1134         }
1135         bank->chip.ngpio = bank->width;
1136
1137         ret = gpiochip_add(&bank->chip);
1138         if (ret) {
1139                 dev_err(bank->dev, "Could not register gpio chip %d\n", ret);
1140                 return ret;
1141         }
1142
1143 #ifdef CONFIG_ARCH_OMAP1
1144         /*
1145          * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1146          * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1147          */
1148         irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
1149         if (irq_base < 0) {
1150                 dev_err(bank->dev, "Couldn't allocate IRQ numbers\n");
1151                 return -ENODEV;
1152         }
1153 #endif
1154
1155         ret = gpiochip_irqchip_add(&bank->chip, irqc,
1156                                    irq_base, omap_gpio_irq_handler,
1157                                    IRQ_TYPE_NONE);
1158
1159         if (ret) {
1160                 dev_err(bank->dev, "Couldn't add irqchip to gpiochip %d\n", ret);
1161                 gpiochip_remove(&bank->chip);
1162                 return -ENODEV;
1163         }
1164
1165         gpiochip_set_chained_irqchip(&bank->chip, irqc,
1166                                      bank->irq, omap_gpio_irq_handler);
1167
1168         for (j = 0; j < bank->width; j++) {
1169                 int irq = irq_find_mapping(bank->chip.irqdomain, j);
1170                 if (bank->is_mpuio) {
1171                         omap_mpuio_alloc_gc(bank, irq, bank->width);
1172                         irq_set_chip_and_handler(irq, NULL, NULL);
1173                         set_irq_flags(irq, 0);
1174                 }
1175         }
1176
1177         return 0;
1178 }
1179
1180 static const struct of_device_id omap_gpio_match[];
1181
1182 static int omap_gpio_probe(struct platform_device *pdev)
1183 {
1184         struct device *dev = &pdev->dev;
1185         struct device_node *node = dev->of_node;
1186         const struct of_device_id *match;
1187         const struct omap_gpio_platform_data *pdata;
1188         struct resource *res;
1189         struct gpio_bank *bank;
1190         struct irq_chip *irqc;
1191         int ret;
1192
1193         match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1194
1195         pdata = match ? match->data : dev_get_platdata(dev);
1196         if (!pdata)
1197                 return -EINVAL;
1198
1199         bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1200         if (!bank) {
1201                 dev_err(dev, "Memory alloc failed\n");
1202                 return -ENOMEM;
1203         }
1204
1205         irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1206         if (!irqc)
1207                 return -ENOMEM;
1208
1209         irqc->irq_startup = omap_gpio_irq_startup,
1210         irqc->irq_shutdown = omap_gpio_irq_shutdown,
1211         irqc->irq_ack = omap_gpio_ack_irq,
1212         irqc->irq_mask = omap_gpio_mask_irq,
1213         irqc->irq_unmask = omap_gpio_unmask_irq,
1214         irqc->irq_set_type = omap_gpio_irq_type,
1215         irqc->irq_set_wake = omap_gpio_wake_enable,
1216         irqc->name = dev_name(&pdev->dev);
1217
1218         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1219         if (unlikely(!res)) {
1220                 dev_err(dev, "Invalid IRQ resource\n");
1221                 return -ENODEV;
1222         }
1223
1224         bank->irq = res->start;
1225         bank->dev = dev;
1226         bank->chip.dev = dev;
1227         bank->dbck_flag = pdata->dbck_flag;
1228         bank->stride = pdata->bank_stride;
1229         bank->width = pdata->bank_width;
1230         bank->is_mpuio = pdata->is_mpuio;
1231         bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1232         bank->regs = pdata->regs;
1233 #ifdef CONFIG_OF_GPIO
1234         bank->chip.of_node = of_node_get(node);
1235 #endif
1236         if (node) {
1237                 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1238                         bank->loses_context = true;
1239         } else {
1240                 bank->loses_context = pdata->loses_context;
1241
1242                 if (bank->loses_context)
1243                         bank->get_context_loss_count =
1244                                 pdata->get_context_loss_count;
1245         }
1246
1247         if (bank->regs->set_dataout && bank->regs->clr_dataout)
1248                 bank->set_dataout = omap_set_gpio_dataout_reg;
1249         else
1250                 bank->set_dataout = omap_set_gpio_dataout_mask;
1251
1252         spin_lock_init(&bank->lock);
1253
1254         /* Static mapping, never released */
1255         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1256         bank->base = devm_ioremap_resource(dev, res);
1257         if (IS_ERR(bank->base)) {
1258                 irq_domain_remove(bank->chip.irqdomain);
1259                 return PTR_ERR(bank->base);
1260         }
1261
1262         platform_set_drvdata(pdev, bank);
1263
1264         pm_runtime_enable(bank->dev);
1265         pm_runtime_irq_safe(bank->dev);
1266         pm_runtime_get_sync(bank->dev);
1267
1268         if (bank->is_mpuio)
1269                 omap_mpuio_init(bank);
1270
1271         omap_gpio_mod_init(bank);
1272
1273         ret = omap_gpio_chip_init(bank, irqc);
1274         if (ret)
1275                 return ret;
1276
1277         omap_gpio_show_rev(bank);
1278
1279         pm_runtime_put(bank->dev);
1280
1281         list_add_tail(&bank->node, &omap_gpio_list);
1282
1283         return 0;
1284 }
1285
1286 #ifdef CONFIG_ARCH_OMAP2PLUS
1287
1288 #if defined(CONFIG_PM)
1289 static void omap_gpio_restore_context(struct gpio_bank *bank);
1290
1291 static int omap_gpio_runtime_suspend(struct device *dev)
1292 {
1293         struct platform_device *pdev = to_platform_device(dev);
1294         struct gpio_bank *bank = platform_get_drvdata(pdev);
1295         u32 l1 = 0, l2 = 0;
1296         unsigned long flags;
1297         u32 wake_low, wake_hi;
1298
1299         spin_lock_irqsave(&bank->lock, flags);
1300
1301         /*
1302          * Only edges can generate a wakeup event to the PRCM.
1303          *
1304          * Therefore, ensure any wake-up capable GPIOs have
1305          * edge-detection enabled before going idle to ensure a wakeup
1306          * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1307          * NDA TRM 25.5.3.1)
1308          *
1309          * The normal values will be restored upon ->runtime_resume()
1310          * by writing back the values saved in bank->context.
1311          */
1312         wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1313         if (wake_low)
1314                 writel_relaxed(wake_low | bank->context.fallingdetect,
1315                              bank->base + bank->regs->fallingdetect);
1316         wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1317         if (wake_hi)
1318                 writel_relaxed(wake_hi | bank->context.risingdetect,
1319                              bank->base + bank->regs->risingdetect);
1320
1321         if (!bank->enabled_non_wakeup_gpios)
1322                 goto update_gpio_context_count;
1323
1324         if (bank->power_mode != OFF_MODE) {
1325                 bank->power_mode = 0;
1326                 goto update_gpio_context_count;
1327         }
1328         /*
1329          * If going to OFF, remove triggering for all
1330          * non-wakeup GPIOs.  Otherwise spurious IRQs will be
1331          * generated.  See OMAP2420 Errata item 1.101.
1332          */
1333         bank->saved_datain = readl_relaxed(bank->base +
1334                                                 bank->regs->datain);
1335         l1 = bank->context.fallingdetect;
1336         l2 = bank->context.risingdetect;
1337
1338         l1 &= ~bank->enabled_non_wakeup_gpios;
1339         l2 &= ~bank->enabled_non_wakeup_gpios;
1340
1341         writel_relaxed(l1, bank->base + bank->regs->fallingdetect);
1342         writel_relaxed(l2, bank->base + bank->regs->risingdetect);
1343
1344         bank->workaround_enabled = true;
1345
1346 update_gpio_context_count:
1347         if (bank->get_context_loss_count)
1348                 bank->context_loss_count =
1349                                 bank->get_context_loss_count(bank->dev);
1350
1351         omap_gpio_dbck_disable(bank);
1352         spin_unlock_irqrestore(&bank->lock, flags);
1353
1354         return 0;
1355 }
1356
1357 static void omap_gpio_init_context(struct gpio_bank *p);
1358
1359 static int omap_gpio_runtime_resume(struct device *dev)
1360 {
1361         struct platform_device *pdev = to_platform_device(dev);
1362         struct gpio_bank *bank = platform_get_drvdata(pdev);
1363         u32 l = 0, gen, gen0, gen1;
1364         unsigned long flags;
1365         int c;
1366
1367         spin_lock_irqsave(&bank->lock, flags);
1368
1369         /*
1370          * On the first resume during the probe, the context has not
1371          * been initialised and so initialise it now. Also initialise
1372          * the context loss count.
1373          */
1374         if (bank->loses_context && !bank->context_valid) {
1375                 omap_gpio_init_context(bank);
1376
1377                 if (bank->get_context_loss_count)
1378                         bank->context_loss_count =
1379                                 bank->get_context_loss_count(bank->dev);
1380         }
1381
1382         omap_gpio_dbck_enable(bank);
1383
1384         /*
1385          * In ->runtime_suspend(), level-triggered, wakeup-enabled
1386          * GPIOs were set to edge trigger also in order to be able to
1387          * generate a PRCM wakeup.  Here we restore the
1388          * pre-runtime_suspend() values for edge triggering.
1389          */
1390         writel_relaxed(bank->context.fallingdetect,
1391                      bank->base + bank->regs->fallingdetect);
1392         writel_relaxed(bank->context.risingdetect,
1393                      bank->base + bank->regs->risingdetect);
1394
1395         if (bank->loses_context) {
1396                 if (!bank->get_context_loss_count) {
1397                         omap_gpio_restore_context(bank);
1398                 } else {
1399                         c = bank->get_context_loss_count(bank->dev);
1400                         if (c != bank->context_loss_count) {
1401                                 omap_gpio_restore_context(bank);
1402                         } else {
1403                                 spin_unlock_irqrestore(&bank->lock, flags);
1404                                 return 0;
1405                         }
1406                 }
1407         }
1408
1409         if (!bank->workaround_enabled) {
1410                 spin_unlock_irqrestore(&bank->lock, flags);
1411                 return 0;
1412         }
1413
1414         l = readl_relaxed(bank->base + bank->regs->datain);
1415
1416         /*
1417          * Check if any of the non-wakeup interrupt GPIOs have changed
1418          * state.  If so, generate an IRQ by software.  This is
1419          * horribly racy, but it's the best we can do to work around
1420          * this silicon bug.
1421          */
1422         l ^= bank->saved_datain;
1423         l &= bank->enabled_non_wakeup_gpios;
1424
1425         /*
1426          * No need to generate IRQs for the rising edge for gpio IRQs
1427          * configured with falling edge only; and vice versa.
1428          */
1429         gen0 = l & bank->context.fallingdetect;
1430         gen0 &= bank->saved_datain;
1431
1432         gen1 = l & bank->context.risingdetect;
1433         gen1 &= ~(bank->saved_datain);
1434
1435         /* FIXME: Consider GPIO IRQs with level detections properly! */
1436         gen = l & (~(bank->context.fallingdetect) &
1437                                          ~(bank->context.risingdetect));
1438         /* Consider all GPIO IRQs needed to be updated */
1439         gen |= gen0 | gen1;
1440
1441         if (gen) {
1442                 u32 old0, old1;
1443
1444                 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1445                 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1446
1447                 if (!bank->regs->irqstatus_raw0) {
1448                         writel_relaxed(old0 | gen, bank->base +
1449                                                 bank->regs->leveldetect0);
1450                         writel_relaxed(old1 | gen, bank->base +
1451                                                 bank->regs->leveldetect1);
1452                 }
1453
1454                 if (bank->regs->irqstatus_raw0) {
1455                         writel_relaxed(old0 | l, bank->base +
1456                                                 bank->regs->leveldetect0);
1457                         writel_relaxed(old1 | l, bank->base +
1458                                                 bank->regs->leveldetect1);
1459                 }
1460                 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1461                 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1462         }
1463
1464         bank->workaround_enabled = false;
1465         spin_unlock_irqrestore(&bank->lock, flags);
1466
1467         return 0;
1468 }
1469 #endif /* CONFIG_PM */
1470
1471 void omap2_gpio_prepare_for_idle(int pwr_mode)
1472 {
1473         struct gpio_bank *bank;
1474
1475         list_for_each_entry(bank, &omap_gpio_list, node) {
1476                 if (!BANK_USED(bank) || !bank->loses_context)
1477                         continue;
1478
1479                 bank->power_mode = pwr_mode;
1480
1481                 pm_runtime_put_sync_suspend(bank->dev);
1482         }
1483 }
1484
1485 void omap2_gpio_resume_after_idle(void)
1486 {
1487         struct gpio_bank *bank;
1488
1489         list_for_each_entry(bank, &omap_gpio_list, node) {
1490                 if (!BANK_USED(bank) || !bank->loses_context)
1491                         continue;
1492
1493                 pm_runtime_get_sync(bank->dev);
1494         }
1495 }
1496
1497 #if defined(CONFIG_PM)
1498 static void omap_gpio_init_context(struct gpio_bank *p)
1499 {
1500         struct omap_gpio_reg_offs *regs = p->regs;
1501         void __iomem *base = p->base;
1502
1503         p->context.ctrl         = readl_relaxed(base + regs->ctrl);
1504         p->context.oe           = readl_relaxed(base + regs->direction);
1505         p->context.wake_en      = readl_relaxed(base + regs->wkup_en);
1506         p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1507         p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1508         p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1509         p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1510         p->context.irqenable1   = readl_relaxed(base + regs->irqenable);
1511         p->context.irqenable2   = readl_relaxed(base + regs->irqenable2);
1512
1513         if (regs->set_dataout && p->regs->clr_dataout)
1514                 p->context.dataout = readl_relaxed(base + regs->set_dataout);
1515         else
1516                 p->context.dataout = readl_relaxed(base + regs->dataout);
1517
1518         p->context_valid = true;
1519 }
1520
1521 static void omap_gpio_restore_context(struct gpio_bank *bank)
1522 {
1523         writel_relaxed(bank->context.wake_en,
1524                                 bank->base + bank->regs->wkup_en);
1525         writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl);
1526         writel_relaxed(bank->context.leveldetect0,
1527                                 bank->base + bank->regs->leveldetect0);
1528         writel_relaxed(bank->context.leveldetect1,
1529                                 bank->base + bank->regs->leveldetect1);
1530         writel_relaxed(bank->context.risingdetect,
1531                                 bank->base + bank->regs->risingdetect);
1532         writel_relaxed(bank->context.fallingdetect,
1533                                 bank->base + bank->regs->fallingdetect);
1534         if (bank->regs->set_dataout && bank->regs->clr_dataout)
1535                 writel_relaxed(bank->context.dataout,
1536                                 bank->base + bank->regs->set_dataout);
1537         else
1538                 writel_relaxed(bank->context.dataout,
1539                                 bank->base + bank->regs->dataout);
1540         writel_relaxed(bank->context.oe, bank->base + bank->regs->direction);
1541
1542         if (bank->dbck_enable_mask) {
1543                 writel_relaxed(bank->context.debounce, bank->base +
1544                                         bank->regs->debounce);
1545                 writel_relaxed(bank->context.debounce_en,
1546                                         bank->base + bank->regs->debounce_en);
1547         }
1548
1549         writel_relaxed(bank->context.irqenable1,
1550                                 bank->base + bank->regs->irqenable);
1551         writel_relaxed(bank->context.irqenable2,
1552                                 bank->base + bank->regs->irqenable2);
1553 }
1554 #endif /* CONFIG_PM */
1555 #else
1556 #define omap_gpio_runtime_suspend NULL
1557 #define omap_gpio_runtime_resume NULL
1558 static inline void omap_gpio_init_context(struct gpio_bank *p) {}
1559 #endif
1560
1561 static const struct dev_pm_ops gpio_pm_ops = {
1562         SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1563                                                                         NULL)
1564 };
1565
1566 #if defined(CONFIG_OF)
1567 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1568         .revision =             OMAP24XX_GPIO_REVISION,
1569         .direction =            OMAP24XX_GPIO_OE,
1570         .datain =               OMAP24XX_GPIO_DATAIN,
1571         .dataout =              OMAP24XX_GPIO_DATAOUT,
1572         .set_dataout =          OMAP24XX_GPIO_SETDATAOUT,
1573         .clr_dataout =          OMAP24XX_GPIO_CLEARDATAOUT,
1574         .irqstatus =            OMAP24XX_GPIO_IRQSTATUS1,
1575         .irqstatus2 =           OMAP24XX_GPIO_IRQSTATUS2,
1576         .irqenable =            OMAP24XX_GPIO_IRQENABLE1,
1577         .irqenable2 =           OMAP24XX_GPIO_IRQENABLE2,
1578         .set_irqenable =        OMAP24XX_GPIO_SETIRQENABLE1,
1579         .clr_irqenable =        OMAP24XX_GPIO_CLEARIRQENABLE1,
1580         .debounce =             OMAP24XX_GPIO_DEBOUNCE_VAL,
1581         .debounce_en =          OMAP24XX_GPIO_DEBOUNCE_EN,
1582         .ctrl =                 OMAP24XX_GPIO_CTRL,
1583         .wkup_en =              OMAP24XX_GPIO_WAKE_EN,
1584         .leveldetect0 =         OMAP24XX_GPIO_LEVELDETECT0,
1585         .leveldetect1 =         OMAP24XX_GPIO_LEVELDETECT1,
1586         .risingdetect =         OMAP24XX_GPIO_RISINGDETECT,
1587         .fallingdetect =        OMAP24XX_GPIO_FALLINGDETECT,
1588 };
1589
1590 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1591         .revision =             OMAP4_GPIO_REVISION,
1592         .direction =            OMAP4_GPIO_OE,
1593         .datain =               OMAP4_GPIO_DATAIN,
1594         .dataout =              OMAP4_GPIO_DATAOUT,
1595         .set_dataout =          OMAP4_GPIO_SETDATAOUT,
1596         .clr_dataout =          OMAP4_GPIO_CLEARDATAOUT,
1597         .irqstatus =            OMAP4_GPIO_IRQSTATUS0,
1598         .irqstatus2 =           OMAP4_GPIO_IRQSTATUS1,
1599         .irqenable =            OMAP4_GPIO_IRQSTATUSSET0,
1600         .irqenable2 =           OMAP4_GPIO_IRQSTATUSSET1,
1601         .set_irqenable =        OMAP4_GPIO_IRQSTATUSSET0,
1602         .clr_irqenable =        OMAP4_GPIO_IRQSTATUSCLR0,
1603         .debounce =             OMAP4_GPIO_DEBOUNCINGTIME,
1604         .debounce_en =          OMAP4_GPIO_DEBOUNCENABLE,
1605         .ctrl =                 OMAP4_GPIO_CTRL,
1606         .wkup_en =              OMAP4_GPIO_IRQWAKEN0,
1607         .leveldetect0 =         OMAP4_GPIO_LEVELDETECT0,
1608         .leveldetect1 =         OMAP4_GPIO_LEVELDETECT1,
1609         .risingdetect =         OMAP4_GPIO_RISINGDETECT,
1610         .fallingdetect =        OMAP4_GPIO_FALLINGDETECT,
1611 };
1612
1613 static const struct omap_gpio_platform_data omap2_pdata = {
1614         .regs = &omap2_gpio_regs,
1615         .bank_width = 32,
1616         .dbck_flag = false,
1617 };
1618
1619 static const struct omap_gpio_platform_data omap3_pdata = {
1620         .regs = &omap2_gpio_regs,
1621         .bank_width = 32,
1622         .dbck_flag = true,
1623 };
1624
1625 static const struct omap_gpio_platform_data omap4_pdata = {
1626         .regs = &omap4_gpio_regs,
1627         .bank_width = 32,
1628         .dbck_flag = true,
1629 };
1630
1631 static const struct of_device_id omap_gpio_match[] = {
1632         {
1633                 .compatible = "ti,omap4-gpio",
1634                 .data = &omap4_pdata,
1635         },
1636         {
1637                 .compatible = "ti,omap3-gpio",
1638                 .data = &omap3_pdata,
1639         },
1640         {
1641                 .compatible = "ti,omap2-gpio",
1642                 .data = &omap2_pdata,
1643         },
1644         { },
1645 };
1646 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1647 #endif
1648
1649 static struct platform_driver omap_gpio_driver = {
1650         .probe          = omap_gpio_probe,
1651         .driver         = {
1652                 .name   = "omap_gpio",
1653                 .pm     = &gpio_pm_ops,
1654                 .of_match_table = of_match_ptr(omap_gpio_match),
1655         },
1656 };
1657
1658 /*
1659  * gpio driver register needs to be done before
1660  * machine_init functions access gpio APIs.
1661  * Hence omap_gpio_drv_reg() is a postcore_initcall.
1662  */
1663 static int __init omap_gpio_drv_reg(void)
1664 {
1665         return platform_driver_register(&omap_gpio_driver);
1666 }
1667 postcore_initcall(omap_gpio_drv_reg);